Abstract: To investigate the influence of basalt fiber length and volume fraction on the workability and mechanical properties of reinforced concrete, this study used slump test, cube compressive strength test, and splitting tensile strength test to systematically analyze the performance of basalt fiber reinforced concrete. The results showed that the workability of concrete was not significantly affected by fiber length, while the effect was significantly limited by fiber content. The slump of concrete with a content of 0.3% decreased by 78 mm compared to that with a content of 0.05%. When the fiber length of basalt increased from 6 mm to 18 mm, the compressive strength of concrete significantly increased, with a maximum increase of 20.2%. However, excessive addition of fibers to concrete can actually lead to a decrease in its compressive strength. As the length and content of basalt fibers increase, the overall splitting tensile strength of concrete shows a trend of first increasing and then decreasing.When the fiber length is 18 mm and the volume fraction increases from 0.05% to 0.15%, the increase in splitting tensile strength of concrete is most significant. This indicates that under these parameter conditions, basalt fibers can fully enhance the tensile performance of concrete. This result further confirms that basalt fibers with reasonable fiber length and dosage combinations have significant effects on improving the mechanical properties of concrete, demonstrating good potential for engineering applications.